(19)
(11) EP 0 644 452 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
11.10.1995 Bulletin 1995/41

(43) Date of publication A2:
22.03.1995 Bulletin 1995/12

(21) Application number: 94114781.1

(22) Date of filing: 20.09.1994
(51) International Patent Classification (IPC)6: G02F 1/1337, G02F 1/1343
(84) Designated Contracting States:
DE FR GB

(30) Priority: 20.09.1993 JP 233262/93
12.10.1993 JP 254028/93

(71) Applicant: HITACHI, LTD.
Chiyoda-ku, Tokyo 101 (JP)

(72) Inventors:
  • Ohe, Masahito
    Hitachi-shi, Ibaraki 316 (JP)
  • Kondo, Katsumi
    Katsuta-shi, Ibaraki 312 (JP)

(74) Representative: Patentanwälte Beetz - Timpe - Siegfried Schmitt-Fumian - Mayr 
Steinsdorfstrasse 10
80538 München
80538 München (DE)


(56) References cited: : 
   
       


    (54) Liquid crystal display device


    (57) The invention relates to a liquid crystal display device having electrodes (3,4,5) which form a picture element matrix and generate an electric field (3) substantially parallel to the substrate (1); it is characterized in that it has a brightness recovering time of not greater than 5 min, the brightness recovering time being the time until the brightness of a displayed portion that has been displayed for 30 min and is turned off, returns to the background brightness. The products (εrρ)LC, (εrρ)AF and/or (εrρ)PAS of the specific dielectric constant εr and the specific resistivity ρ of the liquid crystal layer (LC), the orienting film (AF) and/or the insulating film (PAS) are preferably within the range of 1 x 10⁹ to 8 x 10¹⁵ Ω·cm.









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